The Jantar Mantar, Jaipur Historical Site

Address: Jantar Mantar, Jaipur, Rajasthan 302002, India

Website: https://whc.unesco.org/

Hours: Daily 9:00am-5:00pm

Admission: Adults INR 200 (~$2.50), Indian citizens INR 50 (~$0.60) (fees subject to change)

The Jantar Mantar in Jaipur is an 18th-century astronomical observatory built by Maharaja Sawai Jai Singh II as a set of large-scale instruments for observing celestial movements. The complex consists of masonry and stone devices laid out in a planned arrangement inside a walled precinct in Jaipur, Rajasthan.

Prominent instruments include a giant triangular sundial, hemispherical and cylindrical devices that allow direct sighting and measurement of positions, and a set of calibrated scales and markings used for tracking time and celestial coordinates. The scale and precision of the masonry instruments make the observatory one of the best-preserved examples of pre-modern observational astronomy.

The observatory was constructed in the early 1700s under the patronage of Jai Singh II to improve astronomical tables and astrological calculations, and it formed part of a wider programme of scientific and urban initiatives. It continues to be studied for its mix of empirical observation and traditional astronomical practice.

Located in the walled city of Jaipur, the site is accessible from the city’s main streets and is close to other historic landmarks in the city centre.

• Date and instruments: Built in the early 18th century by Maharaja Sawai Jai Singh II, the site contains 19 large-scale masonry instruments arranged within a walled compound.

What to See#

• Samrat Yantra: The Samrat Yantra, a large triangular sundial about 27 m high that serves as the observatory’s principal timekeeping instrument.
• Jai Prakash and other instruments: The Jai Prakash sundials and other hemispherical instruments used for observing altitudes and tracking celestial coordinates.
• Ram Yantra and Chakra Yantra: Rotating and cylindrical instruments such as the Ram Yantra and the Chakra Yantra used for measuring zenith and azimuth positions of celestial bodies.

Jantar Mantar is in central Jaipur, a short walk from the City Palace and about 15-20 minutes by car from Jaipur Junction railway station. Auto-rickshaws and taxis are abundant; the nearest major bus stops are along MI Road.

• Arrive early (before 9:30am) to use the instruments in clear light and avoid the midday heat.
• Bring a camera with a wide-angle lens - many of the instruments are massive and photos taken at close range capture geometry best.
• Visit with a guide or an audio guide to understand how the masonry instruments track time and celestial positions; without explanation the shapes look like modernist sculptures.